On 02/18/2015 01:51 PM, Jon Hunter wrote:
When using the rtl8192cu in AP mode a few devices (an android phone, iphone and ipad) were unable to associate, where as the laptops I tried could. Using wireshark to sniff the wlan traffic, it appears that the rtl8192cu is not beaconing, however, it is responding to broadcast probe requests and so devices are able to detect the AP. Searching the archives the same issue was reported for this WLAN device and a fix to send an initial beacon frame was proposed [1]. This was rejected as it was modifying the rtlwifi core. This change does the same but from within the rtl8192cu driver and appears to fix the problem. Please note that although this does fix the problem, I don't know if this is the best way or correct way to fix the problem, hence the request for comment. [1] http://permalink.gmane.org/gmane.linux.kernel.wireless.general/96770 Signed-off-by: Jon Hunter <jgchunter@xxxxxxxxx> Cc: Larry Finger <Larry.Finger@xxxxxxxxxxxx> Cc: Chaoming Li <chaoming_li@xxxxxxxxxxxxxx> Cc: coekbe@xxxxxxxxx --- drivers/net/wireless/rtlwifi/rtl8192cu/hw.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/drivers/net/wireless/rtlwifi/rtl8192cu/hw.c b/drivers/net/wireless/rtlwifi/rtl8192cu/hw.c index fe4b699..4fbca80 100644 --- a/drivers/net/wireless/rtlwifi/rtl8192cu/hw.c +++ b/drivers/net/wireless/rtlwifi/rtl8192cu/hw.c @@ -1520,6 +1520,22 @@ void rtl92cu_set_beacon_related_registers(struct ieee80211_hw *hw) _beacon_function_enable(hw, true, true); } +static void _beacon_send_frame(struct ieee80211_hw *hw) +{ + struct rtl_priv *rtlpriv = rtl_priv(hw); + struct rtl_mac *mac = rtl_mac(rtl_priv(hw)); + struct ieee80211_sta *sta; + struct rtl_tcb_desc tcb_desc; + struct sk_buff *skb; + memset(&tcb_desc, 0, sizeof(struct rtl_tcb_desc)); + + skb = ieee80211_beacon_get(hw, mac->vif); + sta = rtl_find_sta(hw, mac->bssid); + + if (!rtlpriv->intf_ops->waitq_insert(hw, sta, skb)) + rtlpriv->intf_ops->adapter_tx(hw, sta, skb, &tcb_desc); +} + void rtl92cu_set_beacon_interval(struct ieee80211_hw *hw) { struct rtl_priv *rtlpriv = rtl_priv(hw); @@ -1529,6 +1545,9 @@ void rtl92cu_set_beacon_interval(struct ieee80211_hw *hw) RT_TRACE(rtlpriv, COMP_BEACON, DBG_DMESG, "beacon_interval:%d\n", bcn_interval); rtl_write_word(rtlpriv, REG_BCN_INTERVAL, bcn_interval); + + /* Send initial beacon frame to start beaconing */ + _beacon_send_frame(hw); } void rtl92cu_update_interrupt_mask(struct ieee80211_hw *hw,
In the current mainline merge between 3.19 and 3.20-rc1, there is code that implements the initial beacon start in the core. The main commit is 33511b157bbc. A second commit, which fixes a problem in mesh beacons, is found in 0b70dc273c13. These were much less intrusive than the one that was rejected, thus they were accepted into the core. I just tested creating an AP using NetworkManager and I was able to connect to a Kindle Fire HD, which is an Android device.
Do these patches not fix the problem for you? There is a report that the beacon startup is unreliable. Perhaps it may be necessary to change the static send_beacon_frame() in the core into rtl_send_beacon_frame(), make it be exported, and call it from rtl92cu_set_beacon_interval().
Larry Larry -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
